Steam-boiler scraper.



'FQS. HAMMOND.

"STEAM BOILER SCRAPER'. APPLICATION FILED A'UG.I0, me. 7

Patanted July 17, 191?.

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mk SHOW FRANK S. HAMMOND, 0F MEDFORD, MASSACHUSETTS.

STEAM-BOILER SGRAPER.

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Application filed August 10, 1916.

To all whom it may concern.

. Be it known that I, FRANK S. HAMMOND, a

citizen of the United States, and a resident of the city of Medford, in the county of Middlesex and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Steam-Boiler Scrapers, of which the following is a full, clear, and exact specification.

The object of this invention is the elfecting of easily operative means for removing sediment which has accumulated in the bottoms of steam boilers, whether the same be mud, rust or scale, and which means can be employed while the boiler is in use, no 1natter how high the pressure may be at the time.

My invention consists essentially in providing a scraper fitted to the contour of the boiler-bottom, and adapted to be forc bly moved along the bottom within the boiler by means operated from outside the latter, and in supplying a conduit through wh ch the muddy water can be discharged outside the boiler, the conduit being constructed to have its intake-end moved close in advance of the scraper.

My preferred meansfor thus movlng the scraper comprises a sprocket chaln connected therewith, and sprocket wheels one of which is rotatable from without the boiler; and my preferred form of conduit is a telescoping one.

In the drawings, Figure 1 is a s de sectional elevation showing my inventlon applied to a boiler. Fig. 2 is a plan View of a portion of the same. Fig. 3 1s a transverse section of the same. Fig. 4 is a detail sectional view on a larger scale showing certain parts of the device.

The boiler 1 which is shown of the usual tubular type, may be of any other form, but my invention is especially adapted for tubular boilers because of their extra need of means for removing scale and sedimentary deposits. The scraper 2 is shaped to have its edge contact with the interior of the boiler, as shown in Fig. 3, and is also curved somewhat as viewed from above, in

order to keep within its confines the mud being scraped up, as indicated in Fig. 2.

For keeping the advancing scraper in communication with the exterior of the boiler, in order that the sediment shall be blown out by the steam pressure as fast as such sediment is accumulated by the scraper,

I Specification of Letters Patent.

.joined by a spindle 13 to Patented July 17, 1917.

Serial No. 114,122.

I prefer to provide a telescopic conduit 3 which is illustrated as made in seven sections slidable one within another as the scraper advances. The largest section 3 is connected by a curved neck 4: to the exterior of the boiler, which neck is normally kept tightly closed, as by a screw plug 5. The smallest section 3 is connected with the scraper 2, and is open thereat so as to receive therefrom the stirred up sediment.

To suitably support the intermediate sections of the conduit, a horizontal bar 6 is located a short distance above the conduit, and grooved wheels 7, each joined by a strap 9 to a section 3, run along said bar.

he means illustrated for causing the travel of the scraper consists of a sprocket chain 10 and sprocket wheels 11 and 12 on which the chain runs. The wheel 12 is a handle 14 at the exterior of the boiler, whereby a forcible turning of the handle will draw the scraper toward either extreme of the boiler, the chain being joined at 15 to the scraper.

To aid in presenting the agitated sediment to the conduit section 3 the scraper is provided with a hood 16 extending substantially its extreme width, the edge of the hood being spaced from the boiler surface sufliciently to permit the sediment to pass to the scraper, but close enough to insure that the water rushing out through the conduit under the pressure of the steam and of gravity, shall take with it all the sediment being disturbed.

This device being capable of convenient use at any time and without interference with the use of the boiler, it can be operated so frequently as to keep the sediment from accumulating to any appreciable depth, and the boiler can be thereby kept so clean as greatly to increase its power per unit of heat as compared with such boilers otherwise only occasionally scraped out.

What I claim is:

1. A boiler scraper comprising a scraper blade fitted to the interior of a boiler interior, a plurality of telescoping tubular sections the smallest of which is attached to the scraper blade, and the largest of which communicates with the exterior of the boiler at one end of the latter, and externally operative means for retracting the smaller sections into the larger and thereby cleaning practically the entire length of the bottom of the boiler.

scraper blade and the exterior of one end 7 of a boiler,

means for moving the blade along the boiler bottom, and a hood connected with the upper part of the scraper blade and having its lower edge close to but spaced from the boiler bottom, whereby the Water rushing into said tubular connection is caused to pass close to the boiler bot- 10 tom immediately in front of the scraper blade, and the disturbed sediment to be swept out through said tubular connection.

In testimony that I claim the foregoing invention, I have hereunto set my hand this 15 3 day of Aug. 1916.

FRANK S. HAMMOND.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents,

Washington, .0. 

